Asking this in France will get you killed, please change it to a more realistic question such as "Why AREN'T you buying bread, you weirdo, you creep, you interloper"

Apparently "Why do you buy bread?" Isn't close enough to "Why are you buying bread?". I can see the different connotation, but how would you say the former in French?

Faire de la bière zoulou...

I just typed achstez for achestez . without 'e'

I wrote exactly that and it said I used the wrong word!!! Not funny!!!